Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: (27 commits) block: remove unused copy_io_context() Documentation: remove anticipatory scheduler info block: remove REQ_HARDBARRIER ioprio: rcu_read_lock/unlock protect find_task_by_vpid call (V2) ioprio: fix RCU locking around task dereference block: ioctl: fix information leak to userland block: read i_size with i_size_read() cciss: fix proc warning on attempt to remove non-existant directory bio: take care not overflow page count when mapping/copying user data block: limit vec count in bio_kmalloc() and bio_alloc_map_data() block: take care not to overflow when calculating total iov length block: check for proper length of iov entries in blk_rq_map_user_iov() cciss: remove controllers supported by hpsa cciss: use usleep_range not msleep for small sleeps cciss: limit commands allocated on reset_devices cciss: Use kernel provided PCI state save and restore functions cciss: fix board status waiting code drbd: Removed checks for REQ_HARDBARRIER on incomming BIOs drbd: REQ_HARDBARRIER -> REQ_FUA transition for meta data accesses drbd: Removed the BIO_RW_BARRIER support form the receiver/epoch code ...
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@@ -16,7 +16,7 @@ you can do so by typing:
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As of the Linux 2.6.10 kernel, it is now possible to change the
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IO scheduler for a given block device on the fly (thus making it possible,
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for instance, to set the CFQ scheduler for the system default, but
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set a specific device to use the anticipatory or noop schedulers - which
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set a specific device to use the deadline or noop schedulers - which
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can improve that device's throughput).
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To set a specific scheduler, simply do this:
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@@ -31,7 +31,7 @@ a "cat /sys/block/DEV/queue/scheduler" - the list of valid names
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will be displayed, with the currently selected scheduler in brackets:
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# cat /sys/block/hda/queue/scheduler
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noop anticipatory deadline [cfq]
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# echo anticipatory > /sys/block/hda/queue/scheduler
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noop deadline [cfq]
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# echo deadline > /sys/block/hda/queue/scheduler
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# cat /sys/block/hda/queue/scheduler
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noop [anticipatory] deadline cfq
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noop [deadline] cfq
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@@ -706,7 +706,7 @@ and is between 256 and 4096 characters. It is defined in the file
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arch/x86/kernel/cpu/cpufreq/elanfreq.c.
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elevator= [IOSCHED]
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Format: {"anticipatory" | "cfq" | "deadline" | "noop"}
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Format: {"cfq" | "deadline" | "noop"}
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See Documentation/block/as-iosched.txt and
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Documentation/block/deadline-iosched.txt for details.
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@@ -21,8 +21,8 @@ three rotations, respectively, to balance the tree), with slightly slower
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To quote Linux Weekly News:
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There are a number of red-black trees in use in the kernel.
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The anticipatory, deadline, and CFQ I/O schedulers all employ
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rbtrees to track requests; the packet CD/DVD driver does the same.
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The deadline and CFQ I/O schedulers employ rbtrees to
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track requests; the packet CD/DVD driver does the same.
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The high-resolution timer code uses an rbtree to organize outstanding
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timer requests. The ext3 filesystem tracks directory entries in a
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red-black tree. Virtual memory areas (VMAs) are tracked with red-black
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